I went looking:
In its ruling the Supreme Court [of Canada] emphasized the interest of the government to prevent the proliferation of child pornography and upheld its prohibition (reversing the decision to strike down the statute at-large), while also recognizing the importance of "adolescent self-fulfillment, self-actualization and sexual exploration and identity." -(Paragraph 109) and that also commentated "To ban the possession of our own private musings thus falls perilously close to criminalizing the mere articulation of thought. " -(Paragraph 108).
Ultimately the court carved out two exceptions to the power, and law:
"1. Self-created expressive material: i.e., any written material or visual representation created by the accused alone, and held by the accused alone, exclusively for his or her own personal use; and
2. Private recordings of lawful sexual activity: i.e., any visual recording, created by or depicting the accused, provided it does not depict unlawful sexual activity and is held by the accused exclusively for private use." -(Paragraph 115).