Where anime's group like [Leopard-Raws], [Zero-Raws], [Yousai-raws] get their sources

It's my turn now to ask you something. :)

Where anime's group like [Leopard-Raws], [Zero-Raws], [Yousai-raws] get their sources?

Few examples:

- [Leopard-Raws] Seikon no Qwaser (Vol.1) (BD 1920x1080 x264 AAC)
Link: nyaatorrents.org

- Source: Seikon no Qwaser Vol 1 (2010) AVC 1080i BD25
Link: ????

- [Yousei-raws] Baka to Test to Shoukanjuu (Vol 1) [BDrip 1920x1080 x264 FLAC]
Link: nyaatorrents.org

- Source: Baka to Test to Shoukanjuu Vol 1 (2010) AVC 1080p BD25
Link: ????

- [Yousei-raws] Angel Beats! (Vol 1) [BDrip 1920x1080 x264 FLAC]
Link: nyaatorrents.org

- Source: Angel Beats! Vol 1 (2010) AVC 1080p BD25
Link: ????

I need some fresh air...

:)

EDIT:

OK. I found this:

[BDMV][100623]聖痕のクェイサー　Vol.3.part1.rar 3KW5pcWab58o 4,000,000,000 50817f4b695187826a7b782a613a4b21dbed9421
[BDMV][100623]聖痕のクェイサー　Vol.3.part2.rar 3KW5pcWab58o 4,000,000,000 8922d0859164dd9de1a9b0691de7228df73aac70
[BDMV][100623]聖痕のクェイサー　Vol.3.part3.rar 3KW5pcWab58o 4,000,000,000 3ab1396abd5b9d7f95b51a7ca78b5ac17252e672
[BDMV][100623]聖痕のクェイサー　Vol.3.part4.rar 3KW5pcWab58o 4,000,000,000 68225bcac9c88fb356af25ec0029c978af3a60cc
[BDMV][100623]聖痕のクェイサー　Vol.3.part5.rar 3KW5pcWab58o 4,000,000,000 78a563c03292f51e824eee1072d693427bafe262
[BDMV][100623]聖痕のクェイサー　Vol.3.part6.rar 3KW5pcWab58o 4,546,443 b2120e0146ac8726ede3bdc17e5fd8ae5098cfd8

It's Seikon no Qwaser Vol 3 (2010) AVC 1080i BD25. They are either on Usenet or PerfectDark. Someone can confirm it?