Alright … You don't need to answer the previous question.
I have just gone through the credits list and researched every single sound. It turns out most sounds come from freesound.org, a few from tt-forums.net forum members and OpenTTD people, and a few sounds are from pdsounds.net.
So. First of all. It is not true that it's mostly Sampling Plus. Thankfully.
Of the freesound.org sounds, the majority of sounds is actually libre now, either CC BY or CC0. Only a handful of sounds are still Sampling Plus. A couple of sounds are under CC BY-NC, however. My guess is that these sounds once were all under Sampling Plus back in the day, long before Creative Commons retired said license. And that freesound.org tried to push their users away from Sampling Plus as a result and most users actually agreed. Whatever, that doesn't matter now.
Now for the hard, cold FACTS!
The following text are the credits taken from readme.ptxt, except I annotated each file with the license I found on the corresponding website. I simply entered the file name and user name into the search bar. But I wasn't able to find a license for every sound.
Code: Select all
- "1sticky8" from "freesound.org"
* Dumpster_Diving.wav (CC0)
- "acclivity" from "freesound.org"
* ChugChugWooHoo.mp3 (CC BY-NC 3.0)
* TwoCows.wav (CC BY-NC 3.0)
- "AGFX" from "freesound.org"
* Squeeky ball Toy_1.L.wav (CC0)
- "Aldor" from "pdsounds.org"
* L'ascenseur - Elevator (Public Domain)
- "alexrigg" from "freesound.org"
* crash_treefall_SE.mp3 (UNKNOWN LICENSE)
- "Anton" from "freesound.org"
* wind1.wav (CC BY 3.0)
- "Benboncan" from "freesound.org"
* Circular saw crosscutting.wav (CC BY 3.0)
- "benhillyard" from "freesound.org"
* Vocal_Splat_08.wav (CC BY-NC 3.0)
- "Bidone" from "freesound.org"
* Affen schreit.mp3 (CC0)
- "cats2009" from "freesound.org"
* blue_angels.wav (CC Sampling Plus 1.0)
- "cfork" from "freesound.org"
* boing_raw.aif (CC BY 3.0)
- "conny" from "freesound.org"
* DATSUN_T.wav (CC Sampling Plus 1.0)
- David R Barnes ("earthcalling") from "pdsounds.org"
* Corner of a sheep field in summer (Public Domain)
- "ddub" from "freesound.org"
* concorde.mp3 (CC Sampling Plus 1.0)
- Derek Murphy ("robbiesurp" at "freesound.org")
* wfl5.5_snap.wav (CC BY 3.0)
- "www.digifishmusic.com" ("digifishmusic" at "freesound.org")
* Passenger jet departs 2.wav (CC BY 3.0)
- "dobroide" from "freesound.org"
* 20060419.horse.neigh.wav (CC BY 3.0)
- Elaine Miller ("Miselaineous" at "freesound.org")
* elaine-growl.wav (CC Sampling Plus 1.0)
- "Goldy-sama" from "freesound.org"
* bulle.wav (CC BY 3.0)
- "Halleck" from "freesound.org"
* JacobsLadderLong2.flac (CC BY 3.0)
- "han1" from "freesound.org"
* Car start and drive.mp3 (CC BY 3.0)
* claxon.wav (CC BY 3.0)
- "HerbertBoland" from "freesound.org"
* MouthPop.wav (CC BY 3.0)
- huha from "tt-forums.net"
* maglev_sound_2.wav (UNKNOWN LICENSE)
- "icmusic" from "freesound.org"
* london bus approaches & leaves.wav (CC BY 3.0)
- Janis Lukss ("Pendrokar" at "wiki.openttd.org")
* Own recordings/mixes (UNKNOWN LICENSE)
- "jascha" from "freesound.org"
* kick_1.wav (CC BY-NC 3.0)
- "JFBSAUVE" from "freesound.org"
* CHAINSAW.wav (CC BY 3.0)
- Jillian Callahan ("JillianCallahan" at "freesound.org")
* generic prop_start(8.395).wav (CC Sampling Plus 1.0)
- "joedeshon" from "freesound.org"
* slide_whistle_down_fast_01.wav (CC BY 3.0)
- "krillion" from "freesound.org"
* flyby.mp3 (CC Sampling Plus 1.0)
- "l0calh05t" from "freesound.org"
* in the smithy 2.wav (CC BY 3.0)
- "Leady" from "freesound.org"
* Dropping a large gun.wav (CC BY 3.0)
- Leon Milo ("milo" at "freesound.org")
* msfinmarken_Bergen.aif (CC BY 3.0)
* ship2_bergen.aif (CC BY 3.0)
- lonemonk from "freesound.org"
* Approx 850 - Enthusiast Audience.wav (CC BY 3.0)
- "lorenzosu" from "freesound.org"
* helicopterRaw_16sec.wav (CC BY-NC 3.0)
- "man" from "freesound.org"
* swosh.aif (CC BY 3.0)
- "Marec" from "freesound.org"
* metro.wav (CC BY 3.0)
- "Matias.Reccius" from "freesound.org"
* crashB.wav (CC0)
- "Necrosensual" from "freesound.org"
* aluminum02.wav (CC0)
- "NoiseCollector" from "freesound.org"
* CRASH2.wav (CC BY 3.0)
- "patchen" from "freesound.org"
* Locomotive 1 Distant horn.wav (CC BY 3.0)
- "Pooleside" from "freesound.org"
* nnb04_maxed.wav (CC BY 3.0)
- Remko Bijker ("Rubidium" at "dev.openttdcoop.org")
* Own work
- Richard Frohlich ("FreqMan" at "freesound.org")
* whoosh06.wav (CC BY 3.0)
- Robert Gacek ("Robinhood76" at "freesound.org")
* 01063 roadworks driller.wav (CC BY-NC 3.0)
- "roscoetoon" from "freesound.org"
* rr_cross5.wav (CC BY 3.0)
* t_start1.mp3 (CC BY 3.0)
- "Q.K." from "freesound.org"
* Metal_03.wav (CC0)
- "sagetyrtle" from "freesound.org"
* crash.wav (CC0)
- "saphix" from "freesound.org"
* file0375.mp3 (CC0)
- "scuola_rocca_di_botte" from "freesound.org"
* Manuel Tarquini.wav (CC Sampling Plus 1.0)
- "Sedi" from "freesound.org"
* ae_51_m.wav (CC BY-NC 3.0)
- "simon.rue" from "freesound.org"
* Boink_v3.wav (CC0)
- "SlykMrByches" from "freesound.org"
* splattt.mp3 (CC0)
- "Stickinthemud" from "freesound.org"
* Bike Horn double toot.wav (CC BY 3.0)
- "suonho" from "freesound.org"
* ELEMENTS_WATER_02_Phasin-bubbles.wav (CC BY 3.0)
- "tigersound" from "freesound.org"
* bird tweet.aif (CC BY-NC 3.0)
* bird tweet 4.aif (CC BY-NC 3.0)
- Timo A. Hummel ("Felicitus" at "dev.openttdcoop.org")
* Own work (UNKNOWN LICENSE)
- Tom Haigh ("audible-edge" at "freesound.org")
* Nissan Maxima burnout (04-25-2009).wav (CC0)
- "VEXST" from "freesound.org"
* Snare 4.wav (CC BY 3.0)
I have messaged (almost) every single author of a sound with a non-free or unknown license and basically requested them to reconsider their license choice. Let's see how many will reply.
Anyways, it sounds like good news to me. So if we were to “liberate” OpenSFX, we apparently don't have to throw away all of the sounds and start from zero, as you can clearly see, many are CC0 or CC BY. We would probably have to throw away
some of the sounds, unless the impossible happens and literally every author decides to release their sounds under a libre license.
If there's any sound that gets “liberated” in the process, I will let you know.