Sony Music says it is "surprised and disappointed" by a prosecutor's raid that seized thousands of discs from its Mexico City offices as part of a legal dispute with ranchera singer Alejandro Fernandez.

Sony Music Entertainment Mexico says the recordings are "totally authorized."

The company said in a statement Sunday that "we trust that the Mexican courts will confirm our rights as soon as possible."

Federal agents seized 6,397 CDs after Fernandez's representatives complained the studio was continuing to use the singer's videos, music and photos, even after his contract with Sony ran out in 2008.

Fernandez has sold 15 million discs and won two Latin Grammy awards. He recently signed with Universal Music.