diff --git a/pdf2htmlEX.1.in b/pdf2htmlEX.1.in
index f437a6f..59e1fa8 100644
--- a/pdf2htmlEX.1.in
+++ b/pdf2htmlEX.1.in
@@ -178,6 +178,12 @@ If set to 1, glyphs narrower than described in PDF will be stretched; otherwise
 .B --squeeze-wide-glyph <0|1> (Default: 1)
 If set to 1, glyphs wider than described in PDF will be squeezed; otherwise it will be truncated.
 
+.TP
+.B --override-fstype <0|1> (Default: 0)
+Clear the fstype bits in TTF/OTF fonts. 
+
+Turn this on if Internet Explorer complains about 'Permission must be Installable' AND you have permission to do so.
+
 .SS Text
 
 .TP
@@ -231,6 +237,8 @@ Specify user password
 .B --no-drm <0|1> (Default: 0)
 Override document DRM settings
 
+Turn this on only when you have permission.
+
 .SS Misc.
 
 .TP
diff --git a/src/HTMLRenderer/font.cc b/src/HTMLRenderer/font.cc
index 0f11453..4bb4b17 100644
--- a/src/HTMLRenderer/font.cc
+++ b/src/HTMLRenderer/font.cc
@@ -561,7 +561,7 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
 
     /* 
      * Step 5 
-     * Generate the font and load the metrics
+     * Generate the font, load the metrics and set the embeddig bits (fstype)
      *
      * Ascent/Descent are not used in PDF, and the values in PDF may be wrong or inconsistent (there are 3 sets of them)
      * We need to reload in order to retrieve/fix accurate ascent/descent, some info won't be written to the font by fontforge until saved.
@@ -575,6 +575,8 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
 
     ffw_load_font(cur_tmp_fn.c_str());
     ffw_metric(&info.ascent, &info.descent);
+    if(param.override_fstype)
+        ffw_override_fstype();
     ffw_save(fn.c_str());
 
     ffw_close();
diff --git a/src/Param.h b/src/Param.h
index 7a4a66b..e9e1f7b 100644
--- a/src/Param.h
+++ b/src/Param.h
@@ -48,6 +48,7 @@ struct Param
     std::string external_hint_tool;
     int stretch_narrow_glyph;
     int squeeze_wide_glyph;
+    int override_fstype;
     
     // text
     double h_eps, v_eps;
diff --git a/src/pdf2htmlEX.cc b/src/pdf2htmlEX.cc
index f54aafd..e17e531 100644
--- a/src/pdf2htmlEX.cc
+++ b/src/pdf2htmlEX.cc
@@ -131,6 +131,7 @@ void parse_options (int argc, char **argv)
         .add("external-hint-tool", &param.external_hint_tool, "", "external tool for hinting fonts (overrides --auto-hint)")
         .add("stretch-narrow-glyph", &param.stretch_narrow_glyph, 0, "stretch narrow glyphs instead of padding them")
         .add("squeeze-wide-glyph", &param.squeeze_wide_glyph, 1, "shrink wide glyphs instead of truncating them")
+        .add("override-fstype", &param.override_fstype, 0, "clear the fstype bits in TTF/OTF fonts")
         
         // text
         .add("heps", &param.h_eps, 1.0, "horizontal threshold for merging text, in pixels")
diff --git a/src/util/ffw.c b/src/util/ffw.c
index 122691e..31a96b4 100644
--- a/src/util/ffw.c
+++ b/src/util/ffw.c
@@ -414,3 +414,10 @@ void ffw_auto_hint(void)
     FVAutoHint(cur_fv);
     FVAutoInstr(cur_fv);
 }
+
+void ffw_override_fstype(void)
+{
+    *(int16 *)(&cur_fv->sf->pfminfo.fstype) = 0;
+    cur_fv->sf->pfminfo.pfmset = true;
+    cur_fv->sf->changed = true;
+}
diff --git a/src/util/ffw.h b/src/util/ffw.h
index 2cfb9ef..bc87b4f 100644
--- a/src/util/ffw.h
+++ b/src/util/ffw.h
@@ -55,6 +55,7 @@ void ffw_set_widths(int * width_list, int mapping_len,
 ////////////////////////
 // others
 void ffw_auto_hint(void);
+void ffw_override_fstype(void);
 
 #ifdef __cplusplus
 }