"liber" is not a word in German. Perhaps you meant "lieber," meaning prefer/better. (Ich spiele lieber Tennis als Golf- I prefer playing tennis over golf. Another example- saying "mir ist lieber" meaning I would prefer...)
Try "incipit liber", which means "first book" in Latin.
Book. It can also mean the adjective 'free.'
Free
But the book's.
The word "Liber" doesn't exist in German. However, there is the word "lieber" (with an added e) which is pronounced exactly the same way as 'Liber'. It means "dear" and is usually the opening of an informal letter. "Dear Martin," "dear grandma" and so on....
Compare may be what the abbreviation 'cp' means before the word 'liber'. The word 'liber' is Latin for book. The Latin abbreviation for 'compare' is 'cf', which is an abbreviation for the verb 'confer' ['to compare'].
Rodney Liber's birth name is Rodney Marvin Liber.
Mirabilis Liber was created in 1522.
Liber Septimus was created in 1690.
Mikhail Liber died in 1937.
Mikhail Liber was born in 1880.
Liber Abaci was created in 1202.