The encyclical contains almost 16,000 words in 42 paragraphs. The first half is said to have been written by Benedict in German, his first language, in the summer of 2005; the second half is derived from uncompleted writings left by his predecessor, Pope John Paul II. The document was signed by Benedict on Christmas Day, 25 December 2005. The encyclical was promulgated a month later in Latin and was translated into English, French, German, Italian, Polish, Portuguese and Spanish. It is the first encyclical to be published since the Vatican decided to assert copyright in the official writings of the pope.