[Trisquel-users] Re : About DRM and Freedom

[magicbanana]

Preventing people to share is always bad. Please, consider a license  
authorizing sharing (even Creative Commons BY-NC-ND, which prevents  
derivative works and any commercial exploitation of your work) and find out  
another business model.

People may actually buy the PDF even though it is freely downloadable  
elsewhere. Crowd funding, as Michał Masłowski proposed, is another option,  
which would be the correct analogy with the teachers paid to do their work.  
Commercials probably are the more common way for online writers to make  
money. You could consider making printed copies, selling goodies, etc.