diff --git a/filter_sage.sed b/filter_sage.sed
deleted file mode 100755
index 7b59fe38d26df073cc2e11d9b0194d08a268ffd8..0000000000000000000000000000000000000000
--- a/filter_sage.sed
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/usr/bin/sed -f
-
-0,/^\\begin{sagesilent}/b nonsage
-/^\\end{sagesilent}/,/^\\begin{sagesilent}/b nonsage
-
-1 {
-:nonsage
-	s/.*\\sage{\(.*\)}.*/# RENDERED TO LATEX: \1/p
-	t end
-	s/.*\\section{\(.*\)}.*/## SECTION \1 ##/
-	T skip;
-	h;s/\S/#/g;H;G;a
-	p
-	b end
-:skip
-	s/.*\\subsection{\(.*\)}.*/# SUB SECTION \1 #/
-	T end;
-	h;s/\S/#/g;H;g;a
-	p
-	b end
-:end
-	d
-}