# copyleft license

> license that any redistributed derivative of the work must also fulfill (it can be free or proprietary)

**Wikidata**: [Q1139274](https://www.wikidata.org/wiki/Q1139274)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Viral_license)  
**Source**: https://4ort.xyz/entity/copyleft-license


## References

1. Freebase Data Dumps. 2013
2. [Source](https://books.google.fr/books?id=7wQzpA8ZkG8C&pg=PT236&lpg=PT236&dq=%22licence+virale%22&source=bl&ots=FZRYqlS4Xh&sig=hSPfAxqIn88bXm-wMtY2-_KBLbo&hl=fr&sa=X&ved=0ahUKEwiAsJLD3u7NAhUhBcAKHcBtBmwQ6AEISTAH#v=onepage&q=%22licence%20virale%22&f=false)