Some files licensed under GPL3 + classpath exception

[nielsvd]

Some files in this repository are licensed under GPL3 + classpath exception, more specifically:

• test_problems/test_d_sim.c
• sim_core/x_sim_rk.c
• sim_core/s_sim_rk.c
• sim_core/d_sim_rk.c
• interfaces/archive/octave/HPIPM_d_solve_ipm2_hard_ocp_qp.c
• archive/test_van_der_pol_sqp.c
• archive/test_van_der_pol_ipm.c
• archive/test_van_der_pol_hyb.c
• archive/test_d_pendulum_sqp.c
• archive/test_d_pendulum_ipm.c
• archive/test_d_pendulum_hyb.c
• archive/test_d_nlp_sqp.c
• archive/test_d_nlp_ipm.c
• archive/sqp/d_gn_sqp.c
• archive/sim_core/d_irk_int.c
• archive/pendulum/vde_hess_model.c
• archive/pendulum/vde_forw_model.c
• archive/pendulum/vde_adj_model.c
• archive/pendulum/ode_model.c
• archive/pendulum/jac_model.c
• archive/ocp_nlp/x_ocp_nlp_sol.c
• archive/ocp_nlp/s_ocp_nlp_sol.c
• archive/ocp_nlp/d_ocp_nlp_sqp.c
• archive/ocp_nlp/d_ocp_nlp_sol.c
• archive/ocp_nlp/d_ocp_nlp_ipm.c
• archive/ocp_nlp/d_ocp_nlp_hyb.c
• archive/ocp_nlp/d_ocp_nlp_aux.c
• archive/ocp_nlp/d_ocp_nlp.c
• archive/include/hpipm_s_ocp_nlp_sol.h
• archive/include/hpipm_d_ocp_nlp_sqp.h
• archive/include/hpipm_d_ocp_nlp_sol.h
• archive/include/hpipm_d_ocp_nlp_ipm.h
• archive/include/hpipm_d_ocp_nlp_hyb.h
• archive/include/hpipm_d_ocp_nlp_aux.h
• archive/include/hpipm_d_ocp_nlp.h
• archive/include/hpipm_d_irk_int.h

It's usually tricky to combine GPL with other licenses in one project. In some cases, GPL might actually be governing the entire project's source distribution terms indirectly.

Is this intentional? If yes, I think it would make sense to prominently note this in the README.

[giaf]

All stuff in archive is old stuff that is not compiled and not included in any library, as such I don't think its licence should interfere. It's just there for "reference" if one day I feel like fixing them.
Does it create any issue for you?

The stuff related to 'sim' is indeed a mistake and should be changed to BSD.

[nielsvd]

That's alright, if the files in archive are completely separate this doesn't cause an issue for us. Thanks for changing the header of the other files.