But that is a very, very good project.
They have somehow convinced several university teachers to contribute their existing lecture notes under Creative Commons licenses. For many of the texts we can find the corresponding PDF online, e.g.:
How did they manage to convince the teachers to use CC licenses?! Amazing.
- farside.ph.utexas.edu/teaching/qmech/Quantum/node121.html using some classic LaTeX to HTML output format
Appears to have mixed licenses? E.g.:
- phys.libretexts.org/Bookshelves/University_Physics/Book%3A_University_Physics_(OpenStax)/Book%3A_University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/06%3A_Photons_and_Matter_Waves/6.06%3A_De_Broglies_Matter_Waves is CC BY
- but we had seen another one that was CC BY-NC-SA
- phys.libretexts.org/Courses/University_of_California_Davis/UCD%3A_Physics_9HE_-_Modern_Physics/06%3A_Emission_and_Absorption_of_Photons/6.1%3A_Transitions_Between_Stationary_States CC BY-SA
Appears to be UC Davies-based mostly.
They claim to use this closed source backend: www.nice.com/resources/cxone-expert-knowledge-management. Feeld dodgy.
- the internal cross references are somewhat broken as of 2022.
- their URLs are HUGE! All components of every ancestor are in it. E.g. check this out: phys.libretexts.org/Bookshelves/Quantum_Mechanics/Introductory_Quantum_Mechanics_(Fitzpatrick)/12%3A_Time-Dependent_Perturbation_Theory/12.13%3A_Forbidden_Transitions Insane.