non-proprietary 
adjective
1Not registered or protected as a trademark or brand name; generic.This is its ‘generic’, i.e. non-proprietary, name....
- But it is a good MP3 player, and more importantly it's a non-proprietary, non-copyright enforcing, song-organising MP3 player.
1.1(Especially of computer hardware or software) conforming to standards that are in the public domain or are widely licensed.It is a widely supported, non-proprietary standard, and there is plenty of software available....
- The following disadvantages might provide reasons for using alternative or non-proprietary software for future projects.
- It is also based on non-proprietary standards and open source software.